thermal: Update usb_pwr_therm2 emul_temp control

Update usb_pwr_therm2 emul_temp control to allow
vendor.disable.usb.overheat.mitigation.control to disable/enable
usbc-port throttling to prevent device offline during thermal
mitigation test in lab.

Bug: 194252201
Test: setprop vendor.disable.usb.overheat.mitigation.control 0/1 to
check usb_pwr_therm2 temperature reading

Change-Id: Ia522706ce32bee68596b977a3e526f0b951a95ca
1 file changed